* Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
> Currently, we'll try mounting any device who's major device number is
> UNNAMED_MAJOR as NFS root. This would happen for non-NFS devices as well (such
> as 9p devices) but it wouldn't cause any issues since mounting the device
> as NFS would fail quickly and the code proceeded to doing the proper mount:
>
> [ 101.522716] VFS: Unable to mount root fs via NFS, trying floppy.
> [ 101.534499] VFS: Mounted root (9p filesystem) on device 0:18.
>
> Commit 6829a048 ("NFS: Retry mounting NFSROOT") has introduced retries when
> mounting NFS root, which means that now we don't immediately fail and instead
> it takes an additional 90+ seconds until we stop retrying, which has revealed
> the issue this patch fixes.
>
> This meant that it would take an additional 90 seconds to boot when we're not
> using a device type which gets detected in order before NFS.
>
> This patch modifies the NFS type check to require device type to be
> 'Root_NFS' instead of requiring the device to have an UNNAMED_MAJOR major.
> This makes boot process cleaner since we now won't go through the NFS mounting
> code at all when the device isn't an NFS root ("/dev/nfs").
>
> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
> ---
> init/do_mounts.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/init/do_mounts.c b/init/do_mounts.c
> index 8dfa0de..d3f0aee 100644
> --- a/init/do_mounts.c
> +++ b/init/do_mounts.c
> @@ -482,7 +482,7 @@ void __init change_floppy(char *fmt, ...)
> void __init mount_root(void)
> {
> #ifdef CONFIG_ROOT_NFS
> - if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
> + if (ROOT_DEV == Root_NFS) {
> if (mount_nfs_root())
> return;
Acked-by: Ingo Molnar <mingo@xxxxxxx>
This bug actively broke my KVM bootup, it gave the impression
that the bootup was hung, while it was just retrying for a
looong time.
Thanks,
Ingo
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